copyToClipboard=function (txt) {
	if(window.clipboardData) {
		window.clipboardData.clearData();
		window.clipboardData.setData("Text",txt);
	}else if(navigator.userAgent.indexOf("Opera")!=-1) {
		window.location=txt;
	}else if(window.netscape) {
		try{
			netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
		}catch(e) {
			alert("您的firefox安全限制限制您进行剪贴板操作，请打开'about:config'将signed.applets.codebase_principal_support'设置为true'之后重试");
			return false;
		}
		var clip=Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);
		if(!clip)
		return ;
		var trans=Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);
		if(!trans)
		return ;
		trans.addDataFlavor('text/unicode');
		var str=new Object();
		var len=new Object();
		var str=Components.classes['@mozilla.org/supports-string;1'].createInstance(Components.interfaces.nsISupportsString);
		var copytext=txt;
		str.data=copytext;
		trans.setTransferData("text/unicode",str,copytext.length*2);
		var clipid=Components.interfaces.nsIClipboard;
		if(!clip)
		return false;
		clip.setData(trans,null,clipid.kGlobalClipboard);
	}
	alert('Successfully Copy Citation to Clipboard!');
}